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c++ Programming Glossary: magnitudeHow does C compute sin() and other math functions? http://stackoverflow.com/questions/2284860/how-does-c-compute-sin-and-other-math-functions all of my implementations are always several orders of magnitude slower even though I think my algorithms are pretty clever obviously..
Does C++ limit recursion depth? http://stackoverflow.com/questions/2630054/does-c-limit-recursion-depth less than the size of RAM by quite a few orders of magnitude but is still pretty large. Luckily large things like string..
In C++, is it still bad practice to return a vector from a function? http://stackoverflow.com/questions/3134831/in-c-is-it-still-bad-practice-to-return-a-vector-from-a-function Whereas in the past the first form could have had order of magnitude worse performance. As a result the first form was a major code..
Access C++ shared library from Java: JNI, JNA, CNI, or SWIG? http://stackoverflow.com/questions/3720563/access-c-shared-library-from-java-jni-jna-cni-or-swig the C API. It can also be slower than JNI by an order of magnitude. However I measured individual calls at a few hundred nanoseconds..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali O APIs and custom buffer management does give an order of magnitude improvement. What extra work is the C standard library doing..
C++ performance challenge: integer to std::string conversion http://stackoverflow.com/questions/4351371/c-performance-challenge-integer-to-stdstring-conversion Code was found that outperforms sprintf by an order of magnitude. ostringstream falls behind by a factor of 50 and more. The..
How to generate the audio spectrum using fft in C++? http://stackoverflow.com/questions/4675457/how-to-generate-the-audio-spectrum-using-fft-in-c then set imaginary parts of input array to zero calculate magnitude of first N 2 FFT output bins sqrt re re im im optionally convert.. N 2 FFT output bins sqrt re re im im optionally convert magnitude to dB log scale 20 log10 magnitude plot N 2 log magnitude values.. im optionally convert magnitude to dB log scale 20 log10 magnitude plot N 2 log magnitude values Note that while FFTW is a very..
Performance of built-in types : char vs short vs int vs. float vs. double http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double slower than integer but it's generally within an order of magnitude or better so long as there is hardware floating point available... be emulated in software. This is slow a couple orders of magnitude slower than integer arithmetic. As I said though people are..
How to implement the factory pattern in C++ correctly http://stackoverflow.com/questions/5120768/how-to-implement-the-factory-pattern-in-c-correctly do struct Vec2 Vec2 float x float y Vec2 float angle float magnitude not a valid overload ... My natural way of thinking is then.. float x float y static Vec2 fromPolar float angle float magnitude ... Which instead of constructors leads me to usage of static.. anyway. Vec2 float x float y Vec2 float angle float magnitude not a valid overload There is an easy workaround for this struct..
JIT compiler vs offline compilers http://stackoverflow.com/questions/538056/jit-compiler-vs-offline-compilers TraceMonkey. I expect to see other improvements of similar magnitude in the not too distant future. This is important because even..
C++ - How to set file permissions (cross platform) http://stackoverflow.com/questions/592448/c-how-to-set-file-permissions-cross-platform The access control model more complex by several orders of magnitude. The access control model uses access control lists ACL to grant..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle the do nothing code will slowly increase decrease the magnitude of the data. So it's actually possible to do better than this..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python and C and was shocked to see my C code run an order of magnitude slower than the equivalent Python code. Since my C is rusty..
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